JPH09195971A - Centrifugal pump and submergible pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve high efficiency, miniaturization, and long life. SOLUTION: A cylindrical body 4 having the circular section is rotatably and watertightly supported on both ends of a housing main body 8. A cage- shaped coil is formed on a cylindrical body 14 mounted on the cylindrical body 4, and a stator is provided inside the housing main body 8 by a coil 20 and a laminated iron 16. Guide vanes 24 are attached to an extending part 4B of the cylindrical body 4, and openings 4C are formed. Electric power is supplied to an electric motor composed of the cage-shaped coil and the stator, the guide vanes 24 are rotated when the cylindrical body 4 is rotated, water in a spiral chamber forming housing 28 is allowed to flow into a spiral chamber 28B by centrifugal force, pressurized and discharged from a discharging port 30A. Simultaneously, water is sucked from a suction pipe 32, and pumping is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal pump and a submersible pump.

[0002]

2. Description of the Related Art An example of a conventional centrifugal pump is shown in FIG.
Guide vanes are housed in the housing 102, and the rotation shaft thereof is connected to the output shaft 104A of the electric motor 104.
When the output shaft 104A of the electric motor 104 rotates, the guide vanes rotate, and the water in the housing 102 is discharged by centrifugal force into the whirlpool chamber formed in the outer peripheral portion of the housing 102, and is pressurized to be discharged. Sent by. On the other hand, water is simultaneously sucked from the suction pipe 110, and as a result, water is pumped.

Further, in the conventional submersible pump, an electric motor is generally arranged at the lower end side, and a water suction port and guide vanes that rotate by the electric motor to drive water are arranged above the electric motor.

[0004]

In the conventional centrifugal pump described above, the output shaft 104A of the electric motor 104 has the suction pipe 1
It is guided through the tube wall 10 into the suction tube 110, and is connected to the rotating shaft of the guide vane. Therefore, the suction pipe 110
As shown in FIG. 3, it is necessary to bend the output shaft 104A at the penetrating portion thereof, and as a result, the water flow has to change its direction at this portion, which is one of the causes of lowering the efficiency.
Further, since the electric motor 104 is arranged separately from the suction pipe 110 and the like, it is difficult to further reduce the size.
Further, there is a problem that the heat generated by the electric motor 104 cannot be efficiently removed, and when the load is large, the electric motor becomes high temperature, the magnetic force is weakened, the output is reduced, or the failure or the life is shortened. It was

On the other hand, in the conventional submersible pump, since the suction port is arranged above the electric motor, for example, the amount of water in the water tank is small, and the electric motor portion is underwater, but the suction port is above the water surface. In such cases, pumping was impossible.
Further, in the case of the conventional submersible pump, there is a similar problem that further downsizing is difficult. Therefore, it is an object of the present invention to provide a centrifugal pump that is efficient, compact, and capable of efficiently removing heat generated by an electric motor.
Another object of the present invention is to provide a submersible pump that can pump water even when the water surface is low, is small, and can efficiently remove heat generated by an electric motor.

[0006]

In order to achieve the above object, a centrifugal pump according to the present invention has a cylindrical body having a circular cross section, a housing main body arranged radially outside the cylindrical body, and an inside of the housing main body. A supporting means for rotatably and watertightly supporting the cylinder around a center line parallel to the extending direction of the cylinder, a rotor of an electric motor formed with the cylinder as a rotation axis, and the housing The stator of the electric motor, which is supported inside the main body and is arranged outside the rotor with a gap formed between the rotor and the extension of the tubular body protruding from the housing main body, A plurality of openings formed at intervals in the outer peripheral portion of the body and a plurality of guide vanes protruding outward in the radial direction, and the extension portion of the tubular body provided at an end portion of the housing body. It is housed together with the guide vanes, and the outlet is A vortex chamber forming housing formed, the rotor is rotationally driven by magnetic interaction between the stator and the rotor to rotate the tubular body together with the plurality of guide blades, It is characterized in that the liquid is sucked from the end of the cylindrical body opposite to the extension, and the sucked liquid is discharged from the discharge port.

Further, the submersible pump of the present invention comprises a cylindrical body having a circular cross section, a housing arranged radially outside the cylindrical body, and a center inside the housing parallel to the extending direction of the cylindrical body. Supporting means for rotatably and watertightly supporting the tubular body around a line, a rotor of an electric motor formed with the tubular body as a rotating shaft, and a rotor supported inside the housing and outside the rotor. , A stator of an electric motor arranged with a gap formed between the rotor and the rotor, inside the tubular body, with a space in the circumferential direction of the tubular body, and radially inward of the tubular body. The stator and the rotor, each of which includes a plurality of protruding guide vanes, a suction portion provided at one end of the tubular body, and a discharge portion provided at the other end of the tubular body. The rotor is rotationally driven by a magnetic interaction between the cylinder and the plurality of cylinders. It tumbled with guide vanes, suction of the liquid through the suction unit, characterized by being adapted to deliver from the discharge portion.

According to the present invention, the stator includes an iron core and a winding attached to the iron core, and the rotor is at least partially formed of a conductive material, and is guided by the rotor and the stator. It is characterized in that an electric motor is formed. The invention is also characterized in that the winding is a three-phase induction winding. The present invention is also characterized in that both the rotor and the stator include an iron core and a winding attached to the iron core, and the rotor and the stator form a DC motor. .

According to the present invention, any one of the rotor and the stator includes an iron core and a winding attached to the iron core, and the other one not including the iron core and the winding. The rotor or the stator includes a permanent magnet, and a DC motor is formed by the rotor and the stator. The present invention is also characterized in that the extension of the tubular body is gradually reduced in diameter in the distal direction. The present invention also comprises the plurality of guide vanes,
It is characterized by including a plurality of guide vanes arranged at different positions in the extending direction of the cylindrical body.

In the centrifugal pump according to the present invention, the cylindrical body is supported by the supporting means so as to be rotatable around the center line of the cylindrical body, and the rotor of the electric motor is formed with the cylindrical body as the rotation axis.
The stator of the electric motor is arranged outside the rotor with a gap formed between the stator and the rotor. Therefore, the magnetic interaction between the stator and the rotor causes the rotor to rotate, which in turn causes the guide vanes attached to the extension of the barrel to rotate. As a result, the liquid in the cylinder is caused to flow out of the opening and the guide blade by the centrifugal force, is pressurized, and is discharged from the discharge port. At the same time, liquid is sucked from the end of the cylinder opposite to the extension, and as a result, water is pumped.

Further, in the submersible pump of the present invention, the tubular body is rotatably supported by the supporting means around the center line of the tubular body, and the rotor of the electric motor is formed with this tubular body as a rotating shaft. . The stator of the electric motor is arranged outside the rotor with a gap formed between the stator and the rotor. Therefore, the magnetic interaction between the stator and the rotor causes the rotor to rotate, and as a result, the guide vanes attached to the inside of the cylinder rotate. As a result, the liquid in the cylinder is driven, and as a result, the liquid flows into the suction unit, flows in the cylinder, and is discharged from the discharge unit.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described. FIG. 1 is a side sectional view showing an example of a centrifugal pump according to the present invention. As shown in FIG. 1, this centrifugal pump 2
Is a cylindrical body 4 forming a rotating shaft, an electric motor rotor 6 including the cylindrical body 4, and an electric motor stator 1 housed in a housing body 8.
0, a guide vane 24 attached to the cylindrical body 4, a housing 28 for forming a vortex chamber, and the like. An opening 8 is provided at both ends of a housing body 8 having a substantially cylindrical shape with a circular cross section.
A is formed, and the bearing 12 and the seal material 13 are attached to the inner surface of the edge portion of the opening 8A. The cylindrical body 4 has a circular cross section, is inserted into the inside of the housing body 8,
The housing body 8 is rotatable about a center line parallel to the extending direction of the tubular body 4 via the bearing 12 and the sealing material 13, and water is prevented from entering the radially outer side of the tubular body 4. Are supported in a watertight manner, and in this embodiment, the bearing 12 and the seal material 13 constitute a supporting means.

In this embodiment, a cylindrical body 14 is closely attached to the outer peripheral surface of the cylindrical body 4 in order to form a three-phase induction motor. A large number of grooves parallel to the center line of the cylinder 4 are formed on the outer peripheral surface of the cylinder 14 at regular intervals in the circumferential direction, and aluminum or copper bars (not shown) are fitted in these grooves. A squirrel cage winding is formed. The tubular body 4 and the tubular body 14 having the cage winding form the rotor 6 of the three-phase induction motor.

Inside the housing body 8, a large number of laminated cores 16 are formed in the circumferential direction of the cylindrical body 14 so as to face the cylindrical body 14 and form a predetermined gap with the surface of the cylindrical body 14. They are arranged at intervals. The ends of the laminated cores 16 on the housing body 8 side are connected to each other by a laminated core 18, and the laminated cores 18 are attached and fixed to the inner surface of the housing body 8. Winding 2 on each laminated core 16
0 is wound. The laminated cores 16 and 18 and the windings 20 form the stator 10 of the three-phase induction motor. The laminated iron cores 16 and 18 may be formed by punching a plate-shaped material by press working in a state where the respective portions of the laminated iron cores 16 and 18 are integrated, and laminating the laminated iron cores 16 and 18 to form an integrated laminated iron core 16. Of course it is possible.

The cylindrical body 4 has a housing body 8 at the upper end.
Has an extension 4B protruding from the opening 8A. In the present embodiment, the extension portion 4B has a smaller diameter toward the tip and has a conical shape. A plurality of guide vanes 24 are provided on the extension 4B,
The extension portion 4B is projected outward in the radial direction at a predetermined interval in the circumferential direction of the extension portion 4B, and an opening 4C is formed at a portion of the extension portion 4B between the guide blades 24.

The spiral chamber forming housing 28 houses the extension 4B and the guide vane 24 inside. The housing 28 for forming a spiral chamber has a circular opening 28A at the center, and the opening 28A is connected to the housing body 8 at the location of the opening 28A so that the opening 28A is aligned with the opening 8A of the housing body 8.

A swirl chamber 28B is formed in the outer peripheral portion of the swirl chamber forming housing 28, and the end portion of the swirl chamber 28B communicates with the inner space of the tubular discharge portion 30 and the end portion of the discharge portion 30. The opening is the discharge port 30A.

A flange 26 is formed at the end of the housing body 8 on the side opposite to the spiral chamber forming housing 28, and a suction pipe 32 is provided on the flange 34.
6 is fixedly connected. The inner diameter of the suction pipe 32 is substantially equal to the inner diameter of the tubular body 4, and the internal space of the suction pipe 32 is the tubular body 4.
Communicates with the interior space of.

When a three-phase AC voltage is applied to the winding 20 through a predetermined cable to the centrifugal pump 2 thus constructed, an electromotive force is generated in the tubular body 14 by the magnetic field generated at the laminated core 16. An electric current is induced to flow, and the magnetic force acting between the laminated iron core 16 and the cylindrical body 14 causes the cylindrical body 1
4, and thus the cylinder 4 is driven to rotate about its center line.

As a result, the plurality of guide vanes 24 attached to the extension portion 4B rotate together with the tubular body 4, and the water in the vortex chamber forming housing 28 is vortexed by centrifugal force as shown by arrow A. It flows out into the spiral chamber 28B formed in the outer peripheral portion of the shape chamber forming housing 28, is pressurized, and is discharged from the discharge port 30A. On the other hand, water is simultaneously sucked from the suction pipe 32, and as a result, water is pumped.

In the centrifugal pump 2, the suction pipe 3
2 does not need to be bent as in the conventional case, and therefore, the water flows straight through the suction pipe 32 without changing its course, so that the decrease in efficiency due to the change in direction of the water flow is eliminated. Further, the cylindrical body 4 forming the rotor of the electric motor also forms a part of the suction pipe, and the electric motor for rotating the guide vanes 24 and the suction pipe are integrated, so that the centrifugal pump can be downsized. Further, since water flows inside the cylindrical body 4 forming the rotor, the electric motor is cooled not only from the outside but also from the inside, and the heat generated by the electric motor is removed very efficiently. As a result, it is possible to prevent a decrease in output due to a decrease in magnetic force due to a high temperature, a failure, or a shortened life.

Next, an example of the submersible pump according to the present invention will be described with reference to the sectional side view of FIG. The electric motor part of the submersible pump 50 has basically the same configuration as that of the centrifugal pump described above, and the same components are designated by the same reference numerals, and a description thereof will be omitted here.

As shown in FIG. 2, in this submersible pump 50, the cylindrical body forming the rotor of the electric motor does not have the above-described extension portion, and the housing 9 (corresponding to the housing body 8).
And a cylindrical body 40 having substantially the same length. This cylinder 40
A plurality of guide vanes 42 are provided inside the cylinder 40 at predetermined intervals in the circumferential direction of the cylinder 40 and extend inward in the radial direction of the cylinder 40.
Are arranged, and one end of each guide blade 42 is attached to the inner surface of the tubular body 40. Further, in this embodiment, the cylindrical body 40
The plurality of guide blades 42 are arranged at two locations in the longitudinal direction.

At the lower part of the tubular body 40, a tubular suction portion 36 having an inner diameter substantially the same as that of the tubular body 40 and having an internal space communicating with the internal space of the tubular body 40 is provided. The lower end portion of the suction portion 36 is closed, while the upper end portion is provided with a flange 38, which is fixed to the housing 9 by attaching the flange 38 to the flange 26. And the suction part 36
A suction port 36A is formed on the side surface of the.

The upper end of the tubular body 40 serves as a discharge port 40A, a flange 44 is formed on the upper end of the housing 9, and the flange 48 of the discharge pipe 46 disposed above the housing 9 is used as the flange 44. The discharge pipe 46 is fixed to the housing 9 by being attached. In this state, the discharge pipe 4
The internal space of 6 communicates with the internal space of the tubular body 40 through the discharge port 40A.

When a three-phase AC voltage is applied to the winding 20 through a predetermined cable with respect to the submersible pump 50 having such a structure, an electromotive force is generated in the cylindrical body 14 by the magnetic field generated at the laminated core 16. An electric current is induced to flow, and the magnetic force acting between the laminated iron core 16 and the cylindrical body 14 causes the cylindrical body 1
4, therefore the cylinder 40 is driven to rotate about its center line.

As a result, the guide blades 42 mounted inside the tubular body 40 rotate together with the tubular body 40, and drive the water in the tubular body 40 upward. As a result, water is sucked into the suction portion 36 through the suction port 36A, and as shown by an arrow B, the cylindrical body 4
It flows upward in 0 and is discharged into the discharge pipe 46 from the discharge port 40A.

In this submersible pump 50, since the suction port 36A is arranged at the bottom, it is possible to pump water even when a little water is stored at the bottom of the water tank. Further, since water flows inside the tubular body 40 forming the rotor, the electric motor is cooled not only from the outside but also from the inside, and the heat generated by the electric motor is extremely efficiently removed. As a result, it is possible to prevent a decrease in output due to a decrease in magnetic force due to a high temperature, a failure, or a shortened life. Furthermore, since the guide vanes that drive water and the electric motor are integrated, the size of the pump can be reduced.

The tips of the guide blades 42 do not necessarily have to be separated as shown in FIG.
Of course, it is also possible to adopt a structure in which the tip ends of 2 are connected at the center of the tubular body 40. Further, in the above embodiment, the three-phase induction motor is used, but of course, the motor may be a single-phase induction motor or a DC motor. In the case of a DC motor, as is conventionally known, the rotor 6 and the stator 10 may each be composed of an iron core and a winding wound around the iron core, or one of them may be composed of a permanent magnet. At that time, when the rotor is composed of the iron core and the winding, the current flowing through the winding may be switched by the commutator and the brush according to the rotation angle of the rotor, as in the conventional DC motor. Further, when the rotor is configured by using permanent magnets, the current supplied to the winding of the stator may be switched according to the rotation angle of the rotor by an appropriate control device.

[0030]

As described above, the centrifugal pump of the present invention has a cylindrical body having a circular cross section, a housing main body arranged radially outside the cylindrical body, and the inside of the housing main body of the cylindrical body. Supporting means for rotatably and watertightly supporting the cylindrical body around a center line parallel to the extending direction, a rotor of an electric motor formed with the cylindrical body as a rotation axis, and a supporting member inside the housing body. On the outside of the rotor,
A stator of the electric motor, which is arranged with a gap between the rotor and the rotor, and an extension portion of a tubular body protruding from the housing body, and formed at an outer circumferential portion of the tubular body at a circumferential interval. A plurality of openings, a plurality of guide vanes protruding outward in the radial direction, and the extension portion of the cylindrical body provided at the end of the housing body together with the guide vanes, and a vortex having a discharge port formed therein. And a housing for forming a shaped chamber, wherein the rotor is rotationally driven by magnetic interaction between the stator and the rotor to rotate the tubular body together with the plurality of guide vanes, The liquid is sucked from the end opposite to the extension, and the sucked liquid is discharged from the discharge port.

Therefore, in this centrifugal pump, the suction pipe does not need to be bent as in the conventional case, and therefore, the water flows straight through the suction pipe without changing the course, so that the efficiency accompanying the change of the direction of the water flow is improved. The drop disappears. Further, the cylindrical body forming the rotor of the electric motor also forms a part of the suction pipe, and the electric motor for rotating the guide vane and the suction pipe are integrated, so that the pump can be downsized. Furthermore, since water flows inside the cylindrical body that constitutes the rotor, the electric motor is cooled not only from the outside but also from the inside, and the heat generated by the electric motor is extremely efficiently removed.
As a result, it is possible to prevent a decrease in output due to a decrease in magnetic force due to a high temperature, a failure, or a shortened life.

Further, the submersible pump of the present invention includes a tubular body having a circular cross section, a housing arranged radially outside the tubular body, and a center inside the housing, the center being parallel to the extending direction of the tubular body. Supporting means for rotatably and watertightly supporting the tubular body around a line, a rotor of an electric motor formed with the tubular body as a rotating shaft, and a rotor supported inside the housing and outside the rotor. , A stator of an electric motor arranged with a gap formed between the rotor and the rotor, inside the tubular body, with a space in the circumferential direction of the tubular body, and radially inward of the tubular body. The stator and the rotor, each of which includes a plurality of protruding guide vanes, a suction portion provided at one end of the tubular body, and a discharge portion provided at the other end of the tubular body. The rotor is rotationally driven by a magnetic interaction between the cylinder and the plurality of cylinders. It tumbled with guide vanes, suction of the liquid through the suction unit, and configured to deliver from the discharge portion.

Therefore, in this submersible pump, since the suction port is arranged at the lowest position, it is possible to pump water even when a little water is stored at the bottom of the water tank. Since the guide vanes that drive the liquid and the electric motor are integrated, the size of the pump can be reduced.
Furthermore, since water flows inside the cylindrical body that constitutes the rotor, the electric motor is cooled not only from the outside but also from the inside, and the heat generated by the electric motor is extremely efficiently removed. As a result, it is possible to prevent a decrease in output due to a decrease in magnetic force due to a high temperature, a failure, or a shortened life.

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view showing an example of a centrifugal pump according to the present invention.

FIG. 2 is a sectional side view showing an example of a submersible pump according to the present invention.

FIG. 3 is a side view showing a conventional centrifugal pump.

[Explanation of symbols]

 2 Volute pumps 4, 14, 40 Cylindrical body 4B Extension part 6 Rotor 8 Housing body 9 Housing 10 Stator 12 Bearing 13 Sealing material 16, 18 Laminated iron core 20 Winding 24, 42 Guide vane 28 Vortex chamber forming housing 28B Vortex chamber 30 Discharge part 30A, 108 Discharge port 32, 110 Suction pipe 36 Suction part 36A Suction port 46 Discharge pipe 50 Submersible pump

Claims (8)

[Claims] 1. A cylindrical body having a circular cross section, a housing main body disposed radially outside the cylindrical body, and inside the housing main body around a center line parallel to the extending direction of the cylindrical body. Supporting means for rotatably and watertightly supporting the cylindrical body, a rotor of an electric motor formed with the cylindrical body as a rotating shaft, and a rotor supported inside the housing main body and outside the rotor. And a stator of the electric motor arranged with a gap formed between the stator and a plurality of members formed at an outer peripheral portion of the cylindrical body at intervals in a circumferential direction at an extension of the cylindrical body protruding from the housing body. A plurality of guide vanes that are open and protrude outward in the radial direction, and the extension portion of the cylindrical body that is provided at the end of the housing body is housed together with the guide vanes to form a spiral chamber in which a discharge port is formed. And a housing for the stator, The rotor is rotationally driven by magnetic interaction with the rotor to rotate the tubular body together with the plurality of guide vanes, and liquid is discharged from an end portion of the tubular body opposite to the extension portion. A centrifugal pump, wherein the suction pump and the sucked liquid are discharged from the discharge port. 2. A cylindrical body having a circular cross section, a housing arranged radially outside the cylindrical body, and inside the housing, the cylindrical body around a center line parallel to the extending direction of the cylindrical body. A rotatably and watertightly supporting means, a rotor of an electric motor formed with the tubular body as a rotating shaft, a rotor supported inside the housing, and outside the rotor, between the rotor. A stator of the electric motor arranged with a gap formed in the inside of the tubular body, with a gap in the circumferential direction of the tubular body,
A plurality of guide vanes protruding inward in the radial direction of the tubular body; a suction section provided at one end of the tubular body; and a discharge section provided at the other end of the tubular body. Comprising, the rotor is driven to rotate by magnetic interaction between the stator and the rotor to rotate the cylindrical body together with the plurality of guide vanes, sucking liquid through the suction portion,
The submersible pump is characterized in that the submersible pump is configured to deliver from the discharge unit. 3. The stator includes an iron core and a winding attached to the iron core, the rotor is at least partially formed of a conductive material, and the rotor and the stator form an induction motor. The centrifugal pump according to claim 1 or the submersible pump according to claim 2. 4. The winding is a three-phase induction winding.
The described centrifugal pump or submersible pump. 5. The motor according to claim 1, wherein both the rotor and the stator include an iron core and a winding attached to the iron core, and the rotor and the stator form a DC motor. A centrifugal pump or the submersible pump according to claim 2. 6. One of the rotor and the stator includes an iron core and a winding attached to the iron core,
The centrifugal pump according to claim 1, wherein the other rotor or stator not including the iron core and the winding includes a permanent magnet, and a DC motor is formed by the rotor and the stator. The submersible pump according to claim 2. 7. The centrifugal pump according to claim 1, wherein the extension portion of the tubular body has a diameter that gradually decreases in the front end direction. 8. The submersible pump according to claim 2, wherein the plurality of guide vanes include a plurality of guide vanes arranged at different positions in the extending direction of the cylindrical body.